To run this Flask Server, run the commands in the root directory:

python3 -m venv .venv &&
. .venv/bin/activate &&
flask run --debug 

To run the summarizer, run the following curl command in another terminal: curl -X POST -H "Content-Type: application/json" -d <JSON> http://127.0.0.1:5000/summarize The database will NOT reset when you run the summarizer!

If you don't want to run a whole bunch of requests at once, you can use the following endpoints:

Initialize the database and credit card

GET /init/<credit_limit>

For the following request bodies, the body should look something like:

    {
        "eventType": <TXN_AUTHED | PAYMENT_INITIATED | TXN_CLEARED | PAYMENT_CANCELED | TXN_SETTLED | PAYMENT_POSTED>,
        "eventTime": <int>,
        "txnId": <string>,
        "amount":<int>
    }

Create a new transaction/payment

POST /authorize

Clear a transaction or cancel a payment

POST /cancel

Settle a transaction or post a payment

POST /settle

To reset it, run: curl http://127.0.0.1:5000/reset

To query the results of the last summary run: curl http://127.0.0.1:5000/summarize

Example JSON:

{
    "creditLimit":1000,
    "events":
        [
            {"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},
            {"eventType":"TXN_SETTLED","eventTime":2,"txnId":"t1","amount":456},
            {"eventType":"TXN_AUTHED","eventTime":3,"txnId":"t2","amount":-456},
            {"eventType":"TXN_SETTLED","eventTime":4,"txnId":"t2","amount":-456}
        ]
}

Example commands:

Refund

curl -X POST -H "Content-Type: application/json" -d '{"creditLimit":1000, "events": [{"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},{"eventType":"TXN_SETTLED","eventTime":2,"txnId":"t1","amount":456},{"eventType":"TXN_AUTHED","eventTime":3,"txnId":"t2","amount":-456},{"eventType":"TXN_SETTLED","eventTime":4,"txnId":"t2","amount":-456}]}' http://127.0.0.1:5000/summarize

Start transaction then cancel it

curl -X POST -H "Content-Type: application/json" -d '{"creditLimit":1000, "events": [{"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},{"eventType":"TXN_AUTH_CLEARED","eventTime":2,"txnId":"t1","amount":456}]}' http://127.0.0.1:5000/summarize

Start transaction then settle it (with tip)

curl -X POST -H "Content-Type: application/json" -d '{"creditLimit":1000, "events": [{"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},{"eventType":"TXN_SETTLED","eventTime":2,"txnId":"t1","amount":456}]}' http://127.0.0.1:5000/summarize

Start transaction then settle it (with tip) and start to pay it

curl -X POST -H "Content-Type: application/json" -d '{"creditLimit":1000, "events": [{"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},{"eventType":"TXN_SETTLED","eventTime":2,"txnId":"t1","amount":456},{"eventType":"PAYMENT_INITIATED","eventTime":3,"txnId":"t2","amount":-456}]}' http://127.0.0.1:5000/summarize

Start transaction then settle it (with tip) and start to pay it but cancel it

curl -X POST -H "Content-Type: application/json" -d '{"creditLimit":1000, "events": [{"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},{"eventType":"TXN_SETTLED","eventTime":2,"txnId":"t1","amount":456},{"eventType":"PAYMENT_INITIATED","eventTime":3,"txnId":"t2","amount":-456},{"eventType":"PAYMENT_CANCELED","eventTime":4,"txnId":"t2","amount":-456}]}' http://127.0.0.1:5000/summarize

Start transaction then settle it (with tip) and pay it off!

curl -X POST -H "Content-Type: application/json" -d '{"creditLimit":1000, "events": [{"eventType":"TXN_AUTHED","eventTime":1,"txnId":"t1","amount":123},{"eventType":"TXN_SETTLED","eventTime":2,"txnId":"t1","amount":456},{"eventType":"PAYMENT_INITIATED","eventTime":3,"txnId":"t2","amount":-456},{"eventType":"PAYMENT_POSTED","eventTime":4,"txnId":"t2","amount":-456}]}' http://127.0.0.1:5000/summarize